/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.BootstrapMethodInfoVisitor;

/**
 * This BootstrapMethodInfoVisitor adds all bootstrap methods that it visits to the given target bootstrap methods
 * attribute.
 */
public class BootstrapMethodInfoAdder implements BootstrapMethodInfoVisitor {
    private final ConstantAdder constantAdder;
    private final BootstrapMethodsAttributeEditor bootstrapMethodsAttributeEditor;

    private int bootstrapMethodIndex;

    /**
     * Creates a new BootstrapMethodInfoAdder that will copy bootstrap methods into the given bootstrap methods
     * attribute.
     */
    public BootstrapMethodInfoAdder(ProgramClass targetClass,
        BootstrapMethodsAttribute targetBootstrapMethodsAttribute) {
        this.constantAdder = new ConstantAdder(targetClass);
        this.bootstrapMethodsAttributeEditor = new BootstrapMethodsAttributeEditor(targetBootstrapMethodsAttribute);
    }

    /**
     * Returns the index of the most recently added bootstrap method.
     */
    public int getBootstrapMethodIndex() {
        return bootstrapMethodIndex;
    }

    // Implementations for BootstrapMethodInfoVisitor.

    public void visitBootstrapMethodInfo(Clazz clazz, BootstrapMethodInfo bootstrapMethodInfo) {
        // Copy the method arguments.
        int methodArgumentCount = bootstrapMethodInfo.u2methodArgumentCount;
        int[] methodArguments = bootstrapMethodInfo.u2methodArguments;
        int[] newMethodArguments = new int[methodArgumentCount];

        for (int index = 0; index < methodArgumentCount; index++) {
            newMethodArguments[index] = constantAdder.addConstant(clazz, methodArguments[index]);
        }

        // Create a new bootstrap method.
        BootstrapMethodInfo newBootstrapMethodInfo =
            new BootstrapMethodInfo(constantAdder.addConstant(clazz, bootstrapMethodInfo.u2methodHandleIndex),
                methodArgumentCount, newMethodArguments);

        // Add it to the target.
        bootstrapMethodIndex = bootstrapMethodsAttributeEditor.addBootstrapMethodInfo(newBootstrapMethodInfo);
    }
}